Properties Of Boric Acid

                Boric acid reacts with sodium hydroxide to form sodium metaborate and sodium tetraborate. 

                   H₃BO₃  +  NaOH  ———>  NaBO₂  +  2H₂O

                  4H₃BO₃  +  2NaOH  ———>  Na₂B₄O₇  +  7H₂0

Action Of Heat:

              Boric acid heated above 170 degree Celsius to gives metaboric acid.

                                 4H₃BO₃  ———>  4HBO₂  +  H₂0

              Boric acid heated above 300 degree Celsius to gives tetraboric acid.

                               4HBO₂   ———>  H₂B₄O₇  +  H₂O

             Tetraboric acid heated above 330 degree celsius to gives boron trioxide.

                               H₂B₄O₇  ———>  2B₂O₃  +  H₂O

Action Of Ethyl Alcohol:

              Boric acid reacts with ethyl alcohol in the presence of concentrated sulphuric acid to form triethylborate. The ethyl borate burns with green edged flame.

                              4H₃BO₃  +  3C2H5OH   ———>   B(OC2H5)3  +  3H2O

Action Of Calcium Fluoride:

            Boric acid reacts with calcium fluoride in the presence of concentrated sulphuric acid to gives boron trifluoride.

                            2H3BO3  +  3CaF₂  +  3H₂SO₄   ———>  2BF₃  +  3CaSO₄  +  6H₂O